Dimensions - User s Manual. Multifunction Transducer MT440

5. MEASUREMENTS _______________________________________________________ 26

6.11 Dimensions

Technical data

Connection table

Function Connection

Measuring input:

AC current

IL1 1/3 IL2 4/6 IL3 7/9

AC voltage

UL1 2 UL2 5 UL3 8 N 11 I/O

Inputs / outputs:

I/O 1 C+ 15

C 16

I/O 2 C+ 17

C 18

I/O 3 C+ 19

C 20

I/O 4 C+ 21

C 22

Auxiliary power supply: + / AC (L) 13 – / AC (N) 14

Communication: RS232 / RS485

Rx / A 23

GND / NC 24

Tx / B 25

Appendix A: Modbus protocol

7. APPENDIX A: MODBUS PROTOCOL

7.1 Modbus communication protocol --- 41

Modbus ... 41

VERSION1: ... 41

VERSION2: ... 45

100% values calculations for normalized measurements... 48

Data types decoding ... 49

Appendix A: Modbus protocol

7.1 Modbus communication protocol

Modbus is enabled via RS232 and RS485 or USB. The response is the same type as the request.

Two versions of MODBUS register tables are available:

− VERSION 1: Compatibility with advanced family of transducers (MT500)

− VERSION 2: Compatibility with previous family of transducers (MI400) Modbus

Modbus protocol enables operation of device on Modbus networks. For device with serial communication the Modbus protocol enables point to point (for example Device to PC) communication via RS232 communication and multi drop communication via RS485 communication. Modbus protocol is a widely supported open interconnect originally designed by Modicon.

The memory reference for input and holding registers is 30000 and 40000 respectively.

VERSION1:

Register table for the actual measurements Parameter

MODBUS Register Type Start End

Reserved 30101 30104

Frequency 30105 30106 T5

U1 30107 30108 T5

Appendix A: Modbus protocol

Parameter

MODBUS Register Type Start End Power Angle Total (atan2(Pt,Qt)) 30172 T17 ϕ 1 (angle between U1 and I1) 30173 T17 ϕ 2 (angle between U2 and I2) 30174 T17 ϕ 3 (angle between U3 and I3) 30175 T17

Internal Temperature 30181 T17

THD HARMONIC DATA

U1 THD% 30182 T16

Actual counter value is calculated: Counter * 10

Exponent

Energy Counter 1 Exponent 30401 T2 Energy Counter 2 Exponent 30402 T2 Energy Counter 3 Exponent 30403 T2 Energy Counter 4 Exponent 30404 T2

Current Active Tariff 30405 T1

Energy Counter 1 30406 30407 T3 Energy Counter 2 30408 30409 T3 Energy Counter 3 30410 30411 T3 Energy Counter 4 30412 30413 T3

Appendix A: Modbus protocol

DYNAMIC DEMAND VALUES

Time Into Period (minutes) 30501 T1

I1 30502 30503 T5 MAX DEMAND SINCE LAST

RESET Register table for the normalized actual measurements

Parameter MODBUS 100%

value

Appendix A: Modbus protocol

Parameter MODBUS 100%

value

Power Angle Total (atan2(Pt,Qt)) 30839 T17 100°

φ12 (angle between U1 and U2) 30840 T17 100°

φ 23 (angle between U2 and U3) 30841 T17 100°

φ 31 (angle between U3 and U1) 30842 T17 100°

Frequency 30843 T17 Fn+10Hz

I1 THD% 30845 T16 100%

MAX DEMAND SINCE LAST

RESET

Appendix A: Modbus protocol

Parameter MODBUS 100%

value Register Type

DYNAMIC DEMAND VALUES

Active Power Total (Pt) - (positive) 30862 T16 Pt value MOD 20000

is returned

Energy Counter 2 30871 T17

Energy Counter 3 30872 T17

Energy Counter 4 30873 T17

Aktiv Tariff 30879 T1

Internal Temperature 30880 T17 100°

VERSION2:

Register table for the actual measurements Parameter

MODBUS Register Type Start End

Frequency 30049 30050 T5

U1 30057 30058 T5

Appendix A: Modbus protocol

Parameter

MODBUS Register Type Start End Power Angle Total (atan2(Pt,Qt)) 30122 T17 ϕ 1 (angle between U1 and I1) 30123 T17 ϕ 2 (angle between U2 and I2) 30124 T17 ϕ 3 (angle between U3 and I3) 30125 T17

Internal Temperature 30126 T17

THD HARMONIC DATA

U1 THD% 30639 T16 value is calculated:

Counter * 10 ^Exponent Energy Counter 1 Exponent 30037 T2

Energy Counter 2 Exponent 30038 T2 Energy Counter 3 Exponent 30039 T2 Energy Counter 4 Exponent 30040 T2

Current Active Tariff 30133 T1

Energy Counter 1 30134 30135 T3 Energy Counter 2 30136 30137 T3 Energy Counter 3 30138 30139 T3 Energy Counter 4 30140 30141 T3

Appendix A: Modbus protocol

DYNAMIC DEMAND VALUES

Time Into Period (minutes) 30174 T1

I1 30175 30176 T5 MAX DEMAND SINCE LAST

RESET Register table for the normalized actual measurements

Parameter RegisterMODBUS Type 100% value

U1 30801 T16 Un

Appendix A: Modbus protocol

Parameter MODBUS 100%

value Register Type

Reactive Power Phase L3 (Q3) 30822 T17 Pn Reactive Power Total (Qt) 30823 T17 Pt Apparent Power Phase L1 (S1) 30824 T16 Pn Apparent Power Phase L2 (S2) 30825 T16 Pn Apparent Power Phase L3 (S3) 30826 T16 Pn Apparent Power Total (St) 30827 T16 Pt Power Factor Phase 1 (PF1) 30828 T17 1 Power Factor Phase 2 (PF2) 30829 T17 1 Power Factor Phase 3 (PF3) 30830 T17 1 Power Factor Total (PFt) 30831 T17 1

All other MODBUS registers are a subject to change. For the latest MODBUS register definitions go to ISKRA MIS’s web page www.iskra-mis.si

100% values calculations for normalized measurements Un = (R40147 / R40146) * R30015 * R40149

In = (R40145 / R40144) * R30017 * R40148 Pn = Un*In

It = In Connection Mode: 1b

It = 3*In Connection Modes: 3b, 4b, 3u, 4u Pt = Pn Connection Mode: 1b

Pt = 3*Pn Connection Modes: 3b, 4b, 3u, 4u Fn = R40150

Appendix A: Modbus protocol

Parameter MODBUS

Values / Dependencies Register Type

Calibration voltage 30015 T4 mV

Calibration current 30017 T4 mA

Register table for the basic settings

Register Content Type Ind Values / Dependencies Min Max P.

Level

40148 Current input range (%)

T16 10000 for 100%

5,00 200,00 2 40149 Voltage input

range (%)

EXAMPLE of calculation using MODBUS registers and their data types:

CT Primary = R40145 (Type T4) = 10^2 × 40 = 8028(16) −> 4000 A/10 = 400A CT Secondary = R40144 (Type T4) = 10^2 × 50 = 8032(16) −> 5000 mA

Cal. Current = R30017 (Type T4) = 10^2 × 50 = 8032(16) −> 5000 mA Input range = R40148 (Type T16) = 10000 = 2710(16) −> 100,00%

In = (R40145 / R40144) * R30017 * R40148 = (400 / 5) * 5A * 100% =400A

Appendix A: Modbus protocol Data types decoding

Type Bit mask Description

T1 Unsigned Value (16 bit) Example: 12345 = 3039(16)

T2 Signed Value (16 bit)

Example: -12345 = CFC7(16) T3 Signed Long Value (32 bit)

Example: 123456789 = 075B CD 15(16)

T4 bits # 15…14 bits # 13…00

Short Unsigned float (16 bit) Decade Exponent(Unsigned 2 bit) Binary Unsigned Value (14 bit) Example: 10000*102 = A710(16)

T5 bits # 31…24 bits # 23…00

Unsigned Measurement (32 bit) Decade Exponent(Signed 8 bit) Binary Unsigned Value (24 bit)

Example: 123456*10-3 = FD01 E240(16)

T6 bits # 31…24 bits # 23…00

Signed Measurement (32 bit) Decade Exponent (Signed 8 bit) Binary Signed value (24 bit)

Example: - 123456*10-3 = FDFE 1DC0(16)

bits # 31…24 bits # 23…16 bits # 15…00

Power Factor (32 bit) Sign: Import/Export (00/FF) Sign: Inductive/Capacitive (00/FF) Unsigned Value (16 bit), 4 decimal places Example: 0.9876 CAP = 00FF 2694(16)

Example: 15:42:03.75 = 7503 4215(16)

T10 Year (unsigned integer) 1998..4095 Example: 10, SEP 2000 = 1009 07D0(16) T16 Unsigned Value (16 bit), 2 decimal places

Example: 123.45 = 3039(16)

T17 Signed Value (16 bit), 2 decimal places Example: -123.45 = CFC7(16)

T_Str4 Text: 4 characters (2 characters for 16 bit register) T_Str6 Text: 6 characters (2 characters for 16 bit register) T_Str8 Text: 8 characters (2 characters for 16 bit register) T_Str16 Text: 16 characters (2 characters for 16 bit register) T_Str40 Text: 40 characters (2 characters for 16 bit register)

Appendix B: Calculations & equations

8. APPENDIX B: CALCULATIONS & EQUATIONS

8.1 Calculations --- 52

Definitions of symbols ... 52

8.2 Equations --- 53

Voltage ... 53

Current ... 53

Power ... 54

THD ... 55

Energy... 55

Appendix B: Calculations & equations

8.1 Calculations

Definitions of symbols

No Symbol Definition 1 Mv Sample factor 2 MP Average interval

3 Uf Phase voltage (U1, U2 or U3)

4 Uff Phase-to-phase voltage (U12, U23 or U31) 5 N Total number of samples in a period 6 n Sample number (0 ≤ n ≤ N) 7 x, y Phase number (1, 2 or 3) 8 in Current sample n 9 ufn Phase voltage sample n 10 ufFn Phase-to-phase voltage sample n

11 φf Power angle between current and phase voltage f (φ1, φ2 or φ3) 12 U_c Agreed supply voltage

Appendix B: Calculations & equations

∑

Phase voltage

N − 128 samples in one period (up to 65 Hz)

∑ −

Phase-to-phase voltage

ux, uy − phase voltages (Uf)

∑

Phase current

N − 128 samples in a period (up to 65 Hz) N − 128 samples in more periods (above 65 Hz)

( )

Appendix B: Calculations & equations

1

Active power by phases

N − a number of samples in a period n − sample number (0 ≤ n ≤ N) f − phase designation

ϕ

Reactive power sign

Qf − reactive power (by phases)

Reactive power by phases (delayed current method)

N −a number of samples in a period n − sample number (0 ≤ n ≤ N) f − phase designation

s Total power angle

Pt − total active power S_t − total apparent power

S

PF = P

Distortion factor

P − total active power S − total apparent power

f f

S

PF = P

Distortion factor

Pf − phase active power S_f − phase apparent power

Appendix B: Calculations & equations

Phase voltage THD U₁ − value of first harmonic

Phase-to-phase voltage THD U1 − value of first harmonic

Price = ⋅

Total exponent of tariff price and energy price in all tariffs

Iskra MIS, d. d.

Ljubljanska cesta 24a SI-4000 Kranj, Slovenia

Phone: 04 237 21 12 Fax: 04 237 21 29 E-mail: [email protected]

www.iskra-mis.si

Printed in Slovenia • Subject to change without notice • Version 1.01 / Sep. 2011 • GB K 22.496.500

In document User s Manual. Multifunction Transducer MT440 (Page 42-60)